Malicious PDF — malware analysis report

Static analysis result for SHA-256 f127835e48bf9b72…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 07:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5c7b54e04d7b7889a325ce8637e1c5c0 SHA-1: e213cd8684eacd7397ffebe76822d6d99ac74fec SHA-256: f127835e48bf9b72abc6a3c83b7ffdeed3c8d00f94037c4b77376d30926683f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to zajinet.ru, suggesting a phishing or redirection attempt. The PDF's structure and the presence of multiple links indicate it functions as a link farm, likely intended to direct users to malicious content or further phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=food+chain+vocabulary+worksheet+answers PDF link annotation
    • http://nowemuzasam.22web.org/51953763772.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/gdVdgdz/screen_recorder_screen_capture.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/53174102089.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/17294888263.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/Eiejahi/oconnors_worcester_facebook.pdfIn PDF document text
    • http://kulapub.22web.org/gimuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/bjhaZhg/special_agent_dale_cooper_shirts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_1afd7c05541043f6b1e195e9ac9bf815.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_87d7af7a08fd407c9135ab58bb675831.pdf?index=trueIn PDF document text
    • http://gikisomu.epizy.com/harry_potter_und_die_kammer_des_schreckens_full_movie_german.pdfIn PDF document text
    • http://podoremekuzepo.rf.gd/do_newborns_need_car_seat_insert.pdfIn PDF document text
    • http://josekopiguvalup.epizy.com/garosapatunupezer.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_3528e4152c3c4c94905c338c3652c2e8.pdf?index=trueIn PDF document text
    • http://foximaxu.rf.gd/kiran_bank_po_maths_book.pdfIn PDF document text
    • http://kexasejuwodeji.epizy.com/wimolimapelusujejefutu.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_f4ecdeb7c3454483a090d324f44d9fe2.pdf?index=trueIn PDF document text
    • http://sakiwut.rf.gd/clinical_chemistry_bishop_8th_edition_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5320 bytes
SHA-256: 4c65db56c3dc44bb10c31f69f6ce34414cee00ce88117b9bda36e0c8f487ebf4
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 11152 bytes
SHA-256: 7806de58f1723e5f169d37038a4ce8e28285e70ae746b05951b241cfae341da0
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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